Heustrich christian mecke



(No Model.) v

H. G. MEGKB.

GRUSHING MILL.

' No. 580,115. PatentedApr. 6, 1897.

UNITED STATES PATENT ()FFICE.

HEINRICH CHRISTIAN MECKE, OF HAMBURG, GERMANY.

CRUSHING-MILLI.

SPECIFICATION forming part of Letters Patent No. 580,115, dated April 6,1897.

Application filed February 6, 1896. Serial No. 578,227. (No model.)

To all whom, it may concern:

Be it known that I, HEINRICH CHRISTIAN MECKE, a citizen of the city ofBremen, residing at Hamburg, in the Empire of Germany, have invented anew and useful Crushing- Mill, of which the following is aspecification.

This invention relates to that class of grinding-mills in which ores,850., are crushed or pulverized between a grinding-rim g and grinding-rollers revolving Within the ring and held in contact therewith, whilerevolving, by centrifugal force.

The invention relates particularly to means for suspending theroller-shafts from the driving-shaft, so as to provide for freedom ofmovement in all directions with the least possible friction, and also tomeans for so connecting the roller-shafts to the driving-shaft as toregulate within proper limits the extent of oscillation tangentiallywith relation to the circle described by the roller-shafts at theirpoints of suspension.

In the drawings, Figure l is a vertical section, and Fig.2 a plan view,of my improved mill.

Referring to said drawings, a is the grinding-chamber, in which issituated the grinding-ring b. Arranged to rotate upon the latter byfriction aretwo or more grinding-rollers c, which are rigidly connectedto shafts cl, that pass through loose bearings c, and at their upperends are formed into journals f, provided with collars, so as torotatively suspend the shafts d in bearings g. The bearings g areball-shaped and rest in spherical or cup-shaped sockets or bearings h,provided in the cross-piece of frame z',which is mounted upon thecentral spindle j of the grindingmill. The step-bearing k of thegrindingspindle is so arranged as to afford ready access thereto. Aboveit the driver Z is secured to the spindle. An elastic or yieldingconnection between the loose bearing 6 and the driver is formed by aspring on, which drags the shaft (Z when the spindle rotates in thedirection indicated by the arrow in Fig. 2, thus permitting just theproper amount of tangential oscillation of the grinding shafts androllers. Stirring arms, blades, or wings a, arranged underneath therollers, move or sweep the material to be ground betweenthegrinding-path b and the rollers c, where it is crushed and ground to thecondition of flour or powder. Above the annular path a sieve -orsiftingframe 0 is arranged, which, while retaining the coarser particlesof the ground material, allows the finer particles to pass through itsmeshes and be discharged from the machine. Propelling-blades p areprovided to drive or throw the ground material toward the sifting-frame.Above the siftingframe 0 the grinding-chamber is closed in by means of acasing q.

By the employment of the ball-and-socket joints for the roller shaftseach roller can swing in all directions, including tangentialoscillation, and, by arranging a driver on the grinding-spindlepreceding or following the roller-shaft and yieldingly connected with itby a loose sleeve or bearing on the shaft and an elastic intermediatelink, as a spring, the extent of tangential oscillation of the rollersis regulated within proper limits.

The ball-and-socket joint for the purposes of the present invention ispreferably constructed in such a manner that when the shaft of theroller revolves round its axis the said joint does not work and wear,the shaft being not immovably connected with the ball-pivot, but theupper end of the shaft forming a gudgeon, by means of which the shaftrotates within the spherical pivot, so that the balland-socket jointmerely serves to allow the pendulum-like motion of the grinding-roller.

What I claim is- 1. In a crushing-mill the combination with across-piece secured to the vertical grindingspindle, of a plurality ofgrinding-rollers suspended in ball-and-socket joints from thecross-piece and a driver secured to the grindingspindle and yieldinglyconnected with each roller-shaft so as to limit the tangentialoscillation of said rollers, substantially as described.

2. In a crushing-mill the combination with a cross-piece secured to thevertical grindingspindle, of a plurality of grinding-rollers suspendedin ball-and-socket joints from the cross-piece and a driver secured tothe grinding-spindle and connected with hearings on the roller-shaftbeneath its point of suspension by means of springs, substantially asdescribed.

3. In a crushing-mill the combination with 111 testimony whereof I havehereunto set my hand in the presence of two subscribing IO Witnesses.

HEINRICH CHRISTIAN MECKE.

Witnesses:

GUSTAF AXMER, E. HH. MUMMANHOFF.

